CN218376526U

CN218376526U - Self-drilling hollow grouting constant-resistance anchor rod for soft rock roadway

Info

Publication number: CN218376526U
Application number: CN202222295461.9U
Authority: CN
Inventors: 张国锋; 黄正谷; 林清; 饶孜; 李雄; 银正川; 欧道刚; 张望
Original assignee: Junlian Chuanmei Furong Xinwei Coal Co ltd; China University of Mining and Technology Beijing CUMTB
Current assignee: Junlian Chuanmei Furong Xinwei Coal Co ltd; China University of Mining and Technology Beijing CUMTB
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2023-01-24
Anticipated expiration: 2032-08-30

Abstract

A self-drilling hollow grouting constant-resistance anchor rod for a soft rock roadway comprises a hollow grouting rod body, a constant-resistance device, a rod body self-drilling drill bit, a grout stopping pad and a constant-resistance device arch tray; the rod body self-drilling type drill bit is fixedly arranged at one end of the hollow grouting rod body, and the constant-resistance device is sleeved at the outer side of the other end of the hollow grouting rod body; the grout stopping pad and the arched tray of the constant resistor are sleeved outside the constant resistor, and the grout stopping pad is positioned on the rock wall side; the hollow grouting rod body is provided with a plurality of grouting holes. The utility model discloses a constant resistance lets presses to strut and slip casting unique function in an organic whole, rely on the constant resistance device to realize with the cavity slip casting body of rod of can lengthening that the high resistance lets the pressure strut during preliminary bracing, make the country rock moderate degree under the high constant resistance effect warp, after warping to the certain degree, in time use cavity cable body structure to realize consolidating the secondary slip casting of country rock, the trouble of having avoided current constant resistance stock and slip casting stock to use simultaneously has been practiced thrift the material, the engineering quantity is reduced, still reduce the destruction to the country rock of punching.

Description

Self-drilling hollow grouting constant-resistance anchor rod for soft rock roadway

Technical Field

The utility model relates to a supporting device field specifically is a soft rock tunnel is from boring formula cavity slip casting constant resistance stock.

Background

Along with coal mining gradually enters a deep area, surrounding rock lithology gradually shows a large deformation phenomenon, and the characteristic of obvious large deformation of soft rock is presented, and the reinforcement and support of a deep soft rock roadway cannot be realized by adopting conventional anchor rod support. Because deep earth pressure and soft rock have large expansion and crushing energy and are damaged by initial large release energy if rigid support is adopted, support is generally carried out in a support mode of giving first place and resisting later to effectively release initial deformation energy for deep earth pressure tunnels and soft rock tunnels. How to realize the support mode of giving first and then resisting and what support means is adopted becomes an important way for solving the support problem of deep rock pressure roadways and soft rock roadways. The main solutions to such problems at present are:

1. the method comprises the steps of adopting an anchor net cable and a steel frame for supporting, adopting the anchor net cable for supporting in the initial stage, enabling the surrounding rock to deform properly under the action of the anchor net cable for supporting, releasing the initial severe deformation energy, then adopting the steel frame for supporting strongly, and realizing rapid stabilization of the surrounding rock through the high resistance of the steel frame. The method can play a role in partial surrounding rock conditions, but for soft rock surrounding rocks, due to the fact that the surrounding rocks have poor strength, long-term rheology occurs under the action of long-term high ground pressure, the surrounding rocks are gradually unstable and broken, and steel frames are crushed. And the anchor net cable can not realize yielding deformation, so that more damage is caused in the initial deformation process, the surrounding rock deformation is aggravated, and the surrounding rock strength loss is large.

2. And adopting anchor grouting and steel frame supporting. The scheme is a supporting scheme aiming at deep earth pressure and soft rock roadway deformation which is more used at present, and has the function of reinforcing surrounding rocks, but the scheme does not use a yielding anchor rod cable, so that the initial deformation of the surrounding rocks cannot be released, the load on a steel frame is larger, the supporting density is higher generally, and the supporting cost is higher.

3. And (4) reinforcing by adopting a constant-resistance anchor rod cable and grouting. The scheme is a constant-resistance yielding scheme newly developed in recent years, grouting reinforcement is adopted, the supporting concept is suitable for deep rock pressure roadways and soft rock roadways, however, in the supporting scheme, anchor net cables need to drill anchor rod and anchor cable holes in surrounding rocks in the initial stage, grouting needs to be performed in the later stage, excessive punching damages to the surrounding rocks are large, and the self-bearing capacity of the surrounding rocks is not favorably exerted. And the quantity of anchor rod cables is large each time, the used material quantity is large, the engineering quantity is large, the construction period is long, and the surrounding rock is seriously damaged and the support is difficult to play a role due to too many anchor rod cable hole drilling under partial conditions.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a soft rock tunnel is from boring formula cavity slip casting constant resistance stock to solve that country rock strength loss is great, the supporting cost is higher and the country rock destroys seriously, strut the problem that also is difficult to the play effect.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a self-drilling hollow grouting constant-resistance anchor rod for a soft rock roadway comprises a hollow grouting rod body, a constant-resistance device, a rod body self-drilling drill bit, a grout stopping pad and a constant-resistance device arch tray; the rod body self-drilling type drill bit is fixedly arranged at one end of the hollow grouting rod body, and the constant-resistance device is sleeved at the outer side of the other end of the hollow grouting rod body; the grout stopping pad and the arched tray of the constant resistor are sleeved outside the constant resistor, and the grout stopping pad is positioned on the rock wall side; the hollow grouting rod body is provided with a plurality of grouting holes.

Further, the constant resistor comprises a wedge-shaped nut, a constant resistor friction bulge, a constant resistor nut and a constant resistor sleeve; the constant-resistance device sleeve is sleeved outside the hollow grouting rod body, and a wedge-shaped nut is sleeved on the hollow grouting rod body positioned inside the constant-resistance device sleeve in a threaded manner; a constant resistor nut is sleeved on the outer side thread at one end of the constant resistor sleeve, and can compress the constant resistor arched tray; constant resistance ware sleeve pipe inside wall evenly distributed is provided with constant resistance ware friction arch.

Furthermore, the end part of the constant resistor sleeve, which is far away from the constant resistor nut, is provided with a constant resistor front end screw thread, the constant resistor front end screw thread is provided with a constant resistor front end fixing nut, and the constant resistor sleeve and the hollow grouting rod body are fixed through the constant resistor front end fixing nut.

Furthermore, a constant-resistor nut spherical pad is arranged between the constant-resistor nut and the constant-resistor arched tray.

Further, the hollow grouting rod body comprises a hollow grouting rod, a rod body end screw thread and a rod body extension sleeve with an inner screw thread; the end part of the hollow grouting rod is provided with a rod body end screw thread, and the hollow grouting rods are fixedly connected through a rod body lengthening sleeve containing an inner screw thread to form a hollow grouting rod body.

Furthermore, the hollow grouting rod body adopts a left-handed thread steel pipe body.

Furthermore, the self-drilling rock two-wing drill bit is connected with the hollow grouting rod body through a screw thread.

Furthermore, a grouting port turnbuckle is arranged at the end part of the hollow grouting rod body, and a port nut is arranged on the grouting port turnbuckle; the grout stopping pad adopts a rubber pad.

Compared with the prior art, the utility model discloses there is following technological effect:

the utility model discloses a soft rock tunnel is from boring formula cavity slip casting constant resistance stock, realized the constant resistance and let press the support and slip casting in the unique function of an organic whole, rely on the constant resistance device and can prolong the cavity slip casting body of rod realization high resistance when preliminary bracing and let press and support, make the country rock in the moderate degree deformation under the high constant resistance effect, after warping to the certain degree, in time use cavity cable body structure to realize consolidating the secondary slip casting of country rock, the trouble of having avoided current constant resistance stock and slip casting stock to use simultaneously, and the material is saved, the engineering volume is reduced, still reduce the destruction of punching to the country rock.

Constant resistance ware is interior friction formula constant resistance ware, interior friction is protruding to be in the same type structure as constant resistance ware body, when country rock extrusion tray drives constant resistance ware and removes to free space, the round platform form nut of the cavity slip casting body of rod begins to slide in the constant resistance ware is inside, the protruding interact of round platform form nut lower extreme and the inside friction of constant resistance ware during the slip, make the body expand during extrusion constant resistance ware body of round platform form nut lower extreme make external diameter thickening, and the protruding friction action that takes place of round platform dress nut lower extreme and the inside friction of constant resistance ware, rely on the friction to produce the constant resistance that the permanent resistance slided.

The utility model discloses use from boring formula rock both wings drill bit, to the surrounding rock breakage, weak, the tunnel of drilling pore-forming difficulty can once only creep into through the mode of stock + self-drilling drill bit, need not use the drilling rod, has realized the design of stock with the drilling rod integration, has improved weak, broken surrounding rock's supporting efficiency greatly.

The grout stopping pad of the utility model is made of rubber and is positioned between the tray and the rock wall to realize the plugging of the orifice; when the anchor rod tray realizes the surrounding rock extrusion effect, the pressure is transmitted to the constant-resistance device sleeve through the tray, and the constant-resistance device sleeve and the hollow grouting rod body are driven to realize the sliding friction effect; the constant-resistance device sleeve nut mainly realizes the pre-tightening tension effect on the constant-resistance device and the rod body through a special installation tool device.

Drawings

FIG. 1: a front view of a self-drilling hollow grouting constant-resistance anchor rod of a soft rock roadway;

FIG. 2: a schematic view of a self-drilling hollow grouting constant-resistance anchor rod constant-resistance device in a soft rock roadway.

Detailed Description

The technical solution provided by the present invention will be described in detail below with reference to the accompanying drawings through the specific implementation of the present invention, so as to provide the technical personnel in the field to use the present invention, but not to limit the present invention.

The method comprises the following specific implementation steps: referring to fig. 1 and 2, in the present invention, a soft rock tunnel self-drilling type hollow grouting constant resistance anchor rod comprises a port nut 85, a fracture thread 84, a constant resistance casing 77, a constant resistance nut 71, a constant resistance nut spherical pad 72, a constant resistance arched tray 73, a slurry stop pad 78, a constant resistance friction protrusion 74, a constant resistance front end thread 75, a constant resistance front end fixing nut 86, a hollow grouting rod 76, a wedge nut 70, a rod end thread 88, a rod extension sleeve 87 containing an inner thread, a rod drilling hole 83, and a rod self-drilling type drill bit 82.

The port nut 85 is a hexagonal nut and is connected with the screw buckle 84 at the grouting port of the hollow grouting rod body, after the constant-resistance hollow grouting anchor rod is installed, the port nut 85 is unscrewed during grouting, then one end of the grouting connector is connected with the screw buckle 84, and the other end of the grouting connector is connected with the grout outlet pipe joint of a grouting pump. Meanwhile, the port nut 85 is a hexagonal body and can be inserted into a rotating sleeve of the anchor rod drilling machine, and the hollow grouting rod body is rotated under the driving of the rotation of the anchor rod drilling machine, so that the hollow grouting rod body plays a role of a drill rod.

The constant resistor is an internal friction type constant resistor and is a cylindrical heat treatment friction-resistant steel pipe, a pipe body with a friction bulge 74 structure is arranged inside the steel pipe, the friction bulge 74 is a heat treatment bulge, the internal friction bulge 74 and the constant resistor pipe body 77 are of an integrated structure, when the surrounding rock extrusion tray drives the constant resistor to move towards a free space, the circular truncated cone-shaped nut 70 of the hollow grouting rod body 76 starts to slide inside the constant resistor, the lower end of the circular truncated cone-shaped nut 70 interacts with the internal friction bulge 74 of the constant resistor during sliding, the outer diameter of the pipe body is expanded and thickened when the lower end of the circular truncated cone-shaped nut 70 extrudes the constant resistor pipe body 77, and the lower end of the circular truncated cone-shaped nut 70 and the internal friction bulge 74 of the constant resistor generate friction action to generate constant resistance to sliding by means of friction. The front section of the constant resistor pipe body comprises a screw thread 75 which is fixed with the hollow grouting rod body 76 to form a whole under the screwing action of a nut 86.

The hollow grouting rod body 76 adopts a heat-treated high-strength left-handed threaded steel pipe body with the diameter of 22mm and 25mm and the material quality of not less than 550MPa, and the thickness of the pipe wall is 1cm; the hollow rod body adopts 1.5m sections, each section is connected by a screw thread 88 and a sleeve 87 to realize extension, and the hollow rod body is generally used by 2-3 sections for extension; 3mm of holes 83 are drilled on the outer part of the pipe body of the hollow grouting rod body 76 outside the constant resistor 77, the distance is 5 cm-8 cm, and the holes are used as grouting liquid outlet ports; the front section of the hollow grouting rod body 76 contains a screw thread, the self-drilling rock two-wing drill bit 82 is connected with the hollow grouting rod body 76 through the screw thread, the hollow grouting rod body 76 can play a role of a drill rod under the action of high strength and high rigidity provided by a high-strength material, a drilling machine component is formed by the hollow grouting rod body 76 and the front end self-drilling two-wing drill bit, and a port nut 85 is directly inserted into a sleeve of an anchor rod drilling machine, so that drilling can be realized; for the roadway with broken and weak surrounding rocks and difficult hole drilling and forming, the roadway can be drilled in one step in the mode of the anchor rod and the self-drilling type drill bit without using a drill rod, so that the integrated design of the anchor rod and the drill rod is realized, and the supporting efficiency of the broken and weak surrounding rocks is greatly improved.

The outer side of the tail end of the constant resistor 77 comprises a pulp stopping pad 78, a constant resistor arched tray 73 and a constant resistor sleeve nut 71. The grout stopping pad 78 is made of rubber, has the thickness of 2-4 mm, is positioned between the tray and the rock wall and blocks an orifice; when the constant-resistance device arched tray 73 realizes the surrounding rock extrusion effect, pressure is transmitted to the constant-resistance device sleeve 77 through the tray, and the constant-resistance device sleeve 77 and the hollow grouting rod body 76 are driven to realize the sliding friction effect; the constant-resistance casing nut 71 mainly realizes the pre-tightening tension action on the constant-resistance device 77 and the hollow grouting rod body 76 through a special installation tool.

During specific installation, firstly, a front-section screw thread 75 and a tightening nut 86 are adopted for a constant-resistance device sleeve 77, and the constant-resistance device sleeve is fixed on a first section of hollow grouting high-strength rod body; then, screwing down and lengthening the second section of the hollow grouting rod body by adopting a screw thread 88 and a lengthening sleeve 87; then screwing the self-drilling type drill bit 82 to the second hollow grouting rod body; then two sections of long hollow grouting rod bodies containing a constant-resistance device sleeve 77 and a self-drilling type drill bit 82 are used as drill rods, end nuts 85 are inserted into rotating sleeves of the anchor drilling machine, a rotating button of the anchor drilling machine is started to drive the rod bodies to rotate, drilling in surrounding rocks is started until the rod bodies and the constant-resistance device sleeve enter the drilled holes, then the anchor drilling machine is dismounted, a slurry stop pad 78, a constant-resistance device arched tray 73, a constant-resistance device nut spherical pad 72 and a constant-resistance device nut 71 are installed on the exposed rod bodies, then a mounting tool device is adopted to stretch the hollow rod bodies, a pneumatic wrench is used for pre-tightening a constant-resistance device sleeve nut 71, and the nut is fixed. After the complete set of the device is installed, the surrounding rock enters a deformation period under the supporting effect of the constant-resistance anchor rod, and when the deformation pressure of the surrounding rock exceeds the friction force between the wedge-shaped nut 70 in the constant-resistance device and the friction bulge 74 in the sleeve of the constant-resistance device, sliding yielding occurs. When the deformation reaches a specific value, the nut 85 is unscrewed, the grouting device is connected with the screw thread 84, one end of the grouting device is connected with a grout outlet pipe joint of a grouting pump, the grouting pump opening valve is opened, grouting grout enters the drill hole from the hollow grouting rod body 76 and finally flows out along the eye 83 to enter the drill hole and fill surrounding rock cracks around the drill hole, and grouting reinforcement of surrounding rocks is achieved.

Therefore, the self-drilling hollow grouting constant-resistance anchor rod for the soft rock roadway has the unique functions of constant-resistance yielding support and grouting, high-resistance yielding support is realized by the aid of the constant-resistance device 77 and the hollow grouting rod body 76 capable of being lengthened during primary support, surrounding rock is moderately deformed under the action of high constant resistance, after the surrounding rock is deformed to a certain degree, secondary grouting reinforcement on the surrounding rock is realized by timely using the hollow grouting rod body 76, troubles in use of the conventional constant-resistance anchor rod and the conventional grouting anchor rod are avoided, materials are saved, engineering quantity is reduced, and damage to the surrounding rock due to punching is also reduced.

Furthermore, although the description is made in terms of embodiments, not every embodiment includes only a single embodiment, and such descriptions in the description are merely for clarity reasons, and it is to be understood that those skilled in the art will recognize that the embodiments described in the various embodiments can be combined as appropriate to form an embodiment understood by those skilled in the art.

Claims

1. A self-drilling hollow grouting constant-resistance anchor rod for a soft rock roadway is characterized by comprising a hollow grouting rod body (76), a constant-resistance device, a rod body self-drilling type drill bit (82), a grout stop pad (78) and a constant-resistance device arched tray (73); the rod body self-drilling type drill bit (82) is fixedly arranged at one end of the hollow grouting rod body (76), and the constant-resistance device is sleeved at the outer side of the other end of the hollow grouting rod body (76); the grout stopping pad (78) and the constant-resistance device arched tray (73) are sleeved outside the constant-resistance device, and the grout stopping pad (78) is positioned on the rock wall side; the hollow grouting rod body (76) is provided with a plurality of grouting holes (83).

2. A soft rock roadway self-drilling hollow grouting constant resistance anchor rod as claimed in claim 1, wherein the constant resistance device comprises a wedge nut (70), a constant resistance device friction protrusion (74), a constant resistance device nut (71) and a constant resistance device sleeve (77); the constant-resistance device sleeve (77) is sleeved on the outer side of the hollow grouting rod body (76), and a wedge-shaped nut (70) is sleeved on the hollow grouting rod body (76) positioned on the inner side of the constant-resistance device sleeve (77) in a threaded manner; a constant resistor nut (71) is sleeved on the outer side thread of one end of the constant resistor sleeve (77), and the constant resistor nut (71) can compress the constant resistor arched tray (73); constant resistance ware sleeve pipe (77) inside wall evenly distributed is provided with constant resistance ware friction arch (74).

3. The soft rock roadway self-drilling hollow grouting constant-resistance anchor rod is characterized in that a constant-resistance device front end screw thread (75) is arranged at the end part, far away from a constant-resistance device nut (71), of a constant-resistance device sleeve (77), a constant-resistance device front end fixing nut (86) is arranged on the constant-resistance device front end screw thread (75), and the constant-resistance device sleeve (77) and the hollow grouting rod body (76) are fixed through the constant-resistance device front end fixing nut (86).

4. A soft rock roadway self-drilling hollow grouting constant resistance anchor rod as claimed in claim 2, characterized in that a constant resistance nut ball pad (72) is provided between the constant resistance nut (71) and the constant resistance arched tray (73).

5. A soft rock roadway self-drilling hollow grouting constant resistance anchor rod as claimed in claim 1, wherein the hollow grouting rod body (76) comprises a hollow grouting rod, a rod body end screw thread (88) and a rod body extension sleeve (87) containing an inner screw thread; the end part of the hollow grouting rod is provided with a rod body end screw thread (88), and a plurality of hollow grouting rods are fixedly connected through rod body extension sleeves (87) containing inner screw threads to form a hollow grouting rod body (76).

6. The self-drilling hollow grouting constant-resistance anchor rod for the soft rock roadway according to claim 5, characterized in that the hollow grouting rod body (76) is a left-handed threaded steel pipe body.

7. A soft rock roadway self-drilling hollow grouting constant resistance anchor rod as claimed in claim 1, characterized in that the self-drilling rock two-wing drill bit (82) is connected with the hollow grouting rod body (76) through a screw thread.

8. The self-drilling hollow grouting constant-resistance anchor rod for the soft rock roadway according to claim 1, characterized in that a grouting port turnbuckle (84) is arranged at the end part of the hollow grouting rod body (76), and a port nut (85) is arranged on the grouting port turnbuckle (84); the grout stopping pad (78) adopts a rubber pad.